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Publ isher/Edi tor ; W. D. Cheek, Sr. aka 0 dr. Rigornortis 

V1N2: February, 1991 

FEEDBACK FROM V1N1 The expiratioi date is clearly evident on your sailing label, too. 

Though it is fairly obvious in leaning, here's an exaaple: say 
It's too soon to really tell for sure, but judging froi the yours is, "91. 12". That leans your subscription expires in 
feedback available so far, YOU appear to like the HSR well enough Decetber , 1991, which is the last issue you'll receive without a 
to coie back for sore, and iuch, such lore is what you're going to renewal. "91.86" leans June, 1991, will be your last issue. Be 
get! If you liked V1N1 , you'll be in ecstasy after a few issues! sure to renew as early as possible to avoid interrupted delivery! 

Personally, I wasn't satisfied with V1N1, but accepted its short- 
coiings as indicators for iiprovesent to coie. It will probably 
be several lonths before I becose coifortable with the overall 
scheie of things here. In the interii, I expect you to let le 
know what you like and what you don't like. I will be throwing a 
wide variety of aaterial at you until I gain a strong sense of 
direction that will appeal to the lajority. But then, that's one 
of our strong points anyway, diversity and flexibility! 


Hake sure we have a filled in subscription blank froi you! There 
are several areas on the sub blank that I take very seriously. 
One is the Types of Equipnent in your lonitoring station. That 
alone tells le a lot of what you want to read about. Another area 
of significant leaning to le is your Career /Prof essio a. That 
tells le soaething about the level on which I can couunicate to 
you the technology of radio. Another iiportant area on the sub 
blank is the Tears of Experience that you have in various aspects 
of radio. This gives le a good idea of what you know and what you 
don't know. So, if we don't have a completed sub blank froi you, 
please send one as soon as possible. It's kind of like a vote. 
We tend to rationalize that a single vote doesn't count for iuch, 
but the aajority of voters get their way in our society. 

There are other benefits of the infonation contained on the sub 
blanks. For exaiple, now I can tell you that 65 1 of our readers 
own a Realistic PRO-2004, PRO-2085 or a PRO-2886. Soie 6 l own a 
BC-769XLT, while 38Z own soie kind of a Bearcat scanner. Catch ly 
drift here? What you own, operate and list on the sub blank is 
your vote! Keep us updated with your scanner equipient inventory! 



Henry Dragonetti of South Carolina writes, "Great job on the first 
issue of the HSR Now I have a question for you: What happened to 
the 520 HHz - 768 HHz lissing band in the PRO-2885 and how can I 
get it back?" 

Editor's Reply; Hell, Henry, nothing 0 happened 0 to that band . 
The designers purposefully left it out, not only in the PRO-2995, 
but also in its predecessor, the PRO-2994 and its successor, the 
PRO-2996 . There are two reasons for this i (1) 529-769 HHz is the 
UHF Television Broadcast band, Ch-22 to Ch-62. The designers 
figure self-respecting scannists are not interested in Monitoring 
television audio in their scanners . (2) The i ost iaportant reason 
is technical, though . You see, scanners have to operate with 
internally generated frequencies, which if nithin the detection 
range of the receiver, w ould result in 0 birdies 0 galore . Since 
the UHF Television Band is not of great interest to the scanning 
hobby, the designers purposefully i ade the innards of the PR0-299x 
w ork inside that 0 useless 0 band . For exanple, the 1st IF section 
of the PR0-299x operates in the range of 697-612 HHz . Other 
pertinent sections of the PR0-299x operate w ithin 559-563 HHz and 
others around 636 HHz . Even if we could liberate 529-769 HHz, 
(which we can't yet), it Mould be so chock full of interference, 
noise, birdies and gunk that it Mould be Morthless. 529-769 HHz 
is inaccessible in i ost other scanners as w ell, probably for the 
sane reasons. If that band Mere included anynay, product revieMS 
Mould be rather negative and sales Mould be iapacted. Thank you 
for your interesting questioa and kind encouragenent! IBC 

Steven Rogovich of Virginia writes, "I ai interested in antennas 
for handheld scanners; upgrading to iiprove reception. I hear 
there are iany available; but where froi?" 

These are necessary evils, of course, for coiputer handling of the 
drudgery that would otherwise lake us think twice about publishing 
this newsletter. The nuabers are always printed on the top line 
of the nailing label. PLEASE, lention your subscription nuiber in 
any correspondence with us. Forget how complicated that nuiber 
can be, because the part we're both interested in is the 4-digit 
nuiber just to the LEFT of the deciaal point. The batch of 
nuibers to the right of the deciial point is for internal stuff 
like housekeeping and light change a time or two before we settle 
on soaething peraanent. The coiputer will find things iuch faster 
than we can without a nuaber. Never fear, though: YOU are not a 
nuiber to us here; only to the coiputer! Even I ai a nuiber to 
this wretched coiputer! But it has to be that way. 

Editor's Reply; Mother good question/ There are several sources 
for you to check out . Bob Grove of Grove Enterprises has 
developed an iaproved antenna for handheld scanners. CRB Research 
carries one that 1 hear is excellent, and Russell Industries takes 
a wide line of antennas for handheld radios of all sorts, types 
and kinds, fro a CB to scanner to Han. So check out all three: / BC 





(Please turn to page 2) 



Harry Abery, Jr. of Connecticut asks about “tracking systems for 
trunked 800 MHz systeas, etc ■ 

Editor's Reply; Harry, we're treading on dangerous ground here. 
It seeas that the Electronic Coaaunications Privacy Act (ECPA) oi 
1986 forbids the interception of data and coaaunications control 
signals altogether. Therefore, any aarket for the hardware about 
*hich you ask Mould tend to be illegitiaate and therefore either 
non-existent or else under cover. 1 don't knoM of anything right 
off, but in a related area, I understand there are so ae systeas 
and software designed to help covert operators track cellular 
aobile telephone calls as they are snitched fro i oie cell to 
another. Hell, trunked radio systeas aren't so different, and it 
is possible that data tracking systeas can be interchangeable to 
an extent. 1 Mill keep an ear peeled and report on anything of 
substance that cones to light. At the aoaeat, 1 understand the 
cellular tracking device costs around $2,5##, so it nouldn't be 
nithin the reach of the casual scannist. /SC 

Clarence Wilken of Illinois wants “tech tips on scanner repairs, 
aodif ications to aarine and coaaercial radios, cellular phones, 
and cordless phones and older scanners such as the BC-250......* 

Editor's Reply; ho problea on the technical tips and stuff on 
repairing scanners. 1 don't think Me Mill branch too far off into 
aarine and coaaercial radios, hoMever, and darned little on 
telephones, be they cordless or cellular. For one thing, I don't 
knoM a heck of a lot about the innards of cellular phones and it 
Mould be as illegal as bank robbing to aonkey around Mith then. 
There are two probleas Mith us getting into aodifying the older 
scanners. One is that there's darned little that can be done to 
then aiyway, especially in the digital departaent, and as for the 
analog (RF/AF) sections, I Mould need the Service hanual and a 
clear scheaatic diagraa in order to assess any potential there. 
Service hanuals and scheaatics for the older scanners are tough, 
if not doMnright iapossible to obtain. I aa not about to go to 
the ti ae, trouble and expense of even trying to obtain this stuff 
for the older scanners Mhen there's hardly a aarket aoyway. I 
Mould be glad to evaluate the BC-25R and any other older scanner 
for Modification potential, but I'll leave it up to YOU to acquire 
for ae the scheaatic diagraas and the Service hanual first. 

Cordless phones are so eleaeatary that Me could explore then fully 
in just one issue of “THE WORLD SCANNER REPORT* at the risk of 
irritating about 9§l of our readers, so Me Mon't do that. You can 
iaprove the perfor nance of any cordless phone by extending the 
length of its antenna/ Just unscreM the old one, and screw in or 
adapt a longer one. If you are technically inclined, get the 

Service hanual for the cordless phone, and give its transaitter a 
good tuneup using a nearby field strength aeter as an indicator. 
You could also use a scanner Mith an S-heter to indicate the 
results of adjusting the transaitter coils. Those coils should be 
tMeaked Mith the desired antenna in place and fully extended. 

Hith a good peak alignaent and a longer antenna, you should be 

able to double or triple the range of your cordless phone. 

Just keep in aind that it aa y be illegal to do this ! /BC 

Jerry Prus of New York writes, “Doc, I'a delighted to hear froa 
you again! Please put as auch 11-aeter (CB) info into the HSR as 
you can without getting into any trouble. 6ood luck!* 

Editor's Reply: Greetings, Jerry! You were a long tiae 

subscriber to ay old ELEVEN METER TIMES It JOURNAL, la fact, I 
found an old SASE froa you laying around here that hadn't been 
used, so I eaployed it to send you the NSR announceaent. Good to 
hear froa you again after all these years/ I do plan to w ork in a 
little CB Material, notably since 362 of our readers are CB’ers. 
It woa’t be auch nor too bawdy like the EhTJ used to be, but I'll 
see m hat Me can do! /BC 

Richard Triller of Depew, New York asks for aaterial on "reducing 
electrical interference, notch filters, scraablers It DVP/DES; 
aeasuring signal loss in cables, filters, couplers, and reducing 
interference froa “birdies* froa a neighbor's scanner.* 

Editor's Reply? How, Richard, you pinpointed so ae aice targets 
that Me Mill deal Mith in the coaing Months. For the tiae being, 
keep an eye out for the availability of ay next book, the SCANNER 
MODIFICATION HANDBOOK, Vol-2 f w hich Mill deal Mith soae of these 
issues in extraordinary detail. I'll let you knoM Mhen the book 
is available as 1 plan to sell autographed copies at ay facility. 
For >ow, let's take a quick look at aeasuriag signal loss in 
scanner accessories such as cables I peripheral devices ; a grand 
project for the casual and dedicated scannist alike. You can buy 
soae awfully expensive equipaent to do this or, you can use a 
scanning receiver Mith an S-Reter at little or no expeise. I hat? 
Your scanner doesi't bare an S-Reter? Right ; a ost don't. I have 
developed three excellent S-lfeters for the PR0-2H4/5/6 and 
possibly soae other scanners and these Mill be featured in ay aew 
book as well. It's a ost unfair for ae to dwell oi aaterial in 
advance of the book coaing out, but rest assured that Me' 11 deal 
heavily Mith S-aeters in the coaing Months! Heaawbile, ho w do you 
eaploy an S-aeter to Measure signal loss in coax cable, for 
exaaple? Easy! Take a reading froa the S-aeter Mith a reference 
signal / tbea change out the coax cable and take another reading. 
The stronger of the two indicates the better or less lossy coax ! 
Apply the saie principle Mith other peripherals such as antennas, 
antenna SMitchers, preaaps, etc. Ruch aore later! /BC 


JAPAN INFORMATION MEDIUM (J.I.H.) has recently introduced four low 
noise, wideband preaaps to Hobby Radio, the H-100, H-75, H-50 and 
the H-2SS. All four actually work to the extent that the scanner 
can receive auch better under certain conditions with thei than 
without thea. The J.I.H. preaaps are aade in Japan and apparently 
distributed by a sole supplier in England, the only source that I 
have aanaged to locate at this tiae. For further inforaation 
including prices and availability, contact: 

Hr. Hike Devereux 
Nevada Coaaunications 
189 London Rd; North End 
Portsaouth, Haapshire, England P02 9AE 
Telephone: (0705) 662145 


V1R2 - Page 2 

I have tested and evaluated the J.I.H. H-180 and M-75 low noise, 
wideband SaAsFET preaaplifiers. Both units coae in sturdy, 
attractive dark aetal cases. There's a good •feel" to thea and 
they work! Here's the lowdown. 

JIH H-180 

Designed especially for transceivers, the H-100 has an RF-sense 
bypass relay that aakes it suitable to work in line with a 
transaitter. Of course, the H-100 can be used in receive-only 
situations, too. The bypass relay has another very useful 
function besides for transacting; it allows the preaap to be 
turned off for non-aaplified reception! The heart of the M-100 is 
a galliua arsenide field effect transistor (GaAsFET) for high gain 
and a very low noise figure over its bandwidth of 24 KHz-2150 HHz. 

were either aarginal or not detectable at all without the H-100 in 
line. Effects of interaod and strong signal overload were 
nonexistent for the aost part, but this was due, at least in part, 
to the relative iaaunity of the PRO-2004 to these deaons. The 
saae H-100, when connected to ay PRO-34 created a host of 
objectionable side effects and interference, though reception was 
notably iaproved under certain conditions. 

I don't know if this applies to all H-100's or just ay test unit, 
but there is a substantial insertion loss (6 to 10 dB) in ay unit 
in the OFF or bypass aode. This is probably due to the 
conventional relay used in the H-100, and it's a siaple fact that 
VHF/UHF signals do not like to go through relay contacts. A 
special RF relay would add substantially to the otherwise aoderate 
cost, however, and the insertion loss is easily overcoae with the 
Gain Control. 

The H-100 can be powered by an internal 9-v battery or any 
external 12 vdc source, such as an AC/DC adaptor or standard 
autoaotive power. The H-100 sports a variable 6ain Control for a 
range of -10 dB to *20 dB. The On/Off switch is on the Gain 
Control. A standard feaale BNC connector is on the top of the 
preaap for siaple connection of the antenna, and a aale BNC 
connector is on the bottoa for easy connection to the scanner; no 
adaptors or special fittings required for aost scanners. The 
H-100 has a Bandpass Filter switch for selection of two filters 
plus a straight-through non-filtered position. A saall LED 
indicates when the preaap is turned on. Specifications of the JIH 
H-100 are as follows: 

Frequency Range: 

Band Pass Filter (A): 

Band Pass Filter (B): 

Non Filtered (C): 


Noise Figure: 

Input/Output Iapedance: 

Transait frequency range: 

Transait power liaits: 

Current consuaption: 

Internal 9v battery: 

External 12v supply: 



225 HHz to 1500 HHz 
108 HHz to 185 HHz 
24 HHz to 2150 HHz 
-10 dB to *20 dB, adjustable 
2 dB, approx 
50 ohas 

24 HHz to 500 HHz 
5 watts, aax; 100 aU, ain 



80aa H x 59aa W x 30aa D 
110g/3.88oz, without battery 

The JIH H-100 is functional for all aaateur (and land aobile) 
handheld transceivers with up to five watts output and for all 
VHF/UHF scanners. The current drain froa the battery is rather 
high and will run a battery down in short order, so several spare 
batteries for field operations are a aust. Any AC/DC adaptor 
rated at 12v/100-aa will work fine to conserve battery usage where 
AC power is available. Other external DC is ok, too. 

The adjustable 6ain Control allows the H-100 to be used for an 
Attenuator as well as an aaplifier which is an ideal feature far 
saae receivers that can be easily overloaded. 

The H-100 is useful for handheld and base scanners alike, but the 
aale BNC output connector presents a ainor problea for base 
scanners unless the preaap is connected directly to the rear of 
the scanner where it is not very handy to operate. I fabricated a 
special patch cable with a regular aale BNC connector on one end 
for the scanner and a feaale BNC connector at the other end for 
the output of the preaap. This allows the H-100 to be placed near 
the front of the scanner for easier operation of the Bain and Band 
Pass Filter controls. On the whole, and considering liaitations, 
side effects and disadvantages, the J.I.H. H-100 is a welcoae 
addition to ay aonitoring post. It allows ae to hear stations so 
far away that it's iapossible to hear thea without the preaap. 
That says soaething. 

JIH H-75 

The H-75 is probably the better deal for scannists who have no use 
for transacting. The H-75 does not have an RF Bypass Relay like 
the H-100, but otherwise is identical in perforaance and 
specifications. It costs less, but looks and perforas the saae as 
the H-100, with one notable exception. Since there is no RF 
Bypass Relay, when the unit is turned off, signals cannot get 
through, therefore it aust be turned ON at ail tiaes the scanner 
is in operation. Current drain is a little less in the H-75 at 
70-aa. The Band Pass Filters, the Gain Control and the internal 
electronics are otherwise the saae as in the H-100, so the 
non-bypass liability can be acceptable given the lower cost of the 
unit. Like the H-180, the H-75 really works, often draaatically, 
providing signals with full quieting froa well beyond 100 ailes. 

JIH H-50 

I have not seen this unit; only a press release and a photo. It 
does not appear to have a gain control nor the Band Pass Filters, 
and the specified bandwidth is 25 HHz to 1300 HHz. It would 
appear that the H-50 is GaAsFET based, so its perforaance should 
be better than nothing under soae conditions. 

JIH H-200 

I did not test the H-100 with a transaitter so I can't offer an 
opinion there. In a word, it worked very well for receiving 
purposes. Using ay Turbocharged PRO-2004, there were aany signals 
received froa distances of 100-150 ailes with full quieting that 

I have not seen this unit, either, but a press release says the 
H-200 is a base station version of the H-75! If equal in all 
other respects, this could be the unit to watch for! 


V1H2 - Page 3 

EDITOR'S NOTE; It seems that everybody and his brother has a 
preamplifier on the market for scanners now. You have to BENARE 
since there is a lot of high technology that has to go into mhat 
seems to be just a simple preamp . Preamps for shortxave radios 
are old hat and can be fabricated by the greenest novice , but the 
story is totally different for VRF-UNF receivers ! Bain is not so 
important as LOR NOISE and tide BANDN1DTN/ host of the preamps 1 
have seen offered on the domestic (ISA market do not appear to be 
worth your time and money . I have tested a fen to confirm this 
suspicion . 1 can, nithout hesitation, say that the JIB N-199 and 
fl-75 preamps perform nell beyond my minimum expectations for 
scanner preamps ! 1 nish I could offer you a domestic source to 
obtain them, but NEVADA C0HHUN1CAII0NS appears to be the sole 
outlet . Nan y readers might be reluctant to trade nith a foreign 
country, but NEVADA is one of England’s largest radio facilities 
and all my dealings nith them have been favorable . NEK4D4 
C0NNUN1CATI0HS accepts Visa and Baster Cards for payment, but your 
card company will charge currency exchange fees on top of the 
actual purchase amounts 1 do not plan to stock these preamps 
because of high inventory and purchase costs, but if there are 
enough of you readers who want one of these units, I will consider 
accepting special orders and then place a single guantity order . 
Contact *e if interested . I cannot guote prices at this time, but 
expect something like $ 175 for the N-299; $150 for the N-199; $125 
for the #-75; and $100 for the N-59, though these are nothing more 
than guesses at this time . 


by "Professor Peabody" 

Rocky and Bui 1 winkle aay be old and graying but l'i still around 
and deep into scanners now. It was with great expectations and 
enthusiasa for a new toy that I eagerly awaited the arrival of an 
AR-3000 to ay station. Ripping and tearing open the box, I found 
a saall, lightweight scanner with a sloped front and a gray paint 
job on a plastic case. I used a digital aultiaeter (ohaceter) to 
see if the paint was conductive as an RFI shield, but to ay dismay 
it was not. Modern radios such as the PRO-2005 and the AR-3000 
are so sensitive that strong local signals can penetrate the 
plastic cases into the RF section and run totally aaok causing 
havoc. Soaehow the AR-3000 was less sensitive to local signal 
interference. I plugged it into power and turned it on. Then 
without looking at the aanual, I pushed buttons, cranked dials and 
twisted knobs to deteraine if it could be intuitively operated. 

Hopelessly aired down with no idea as to how it worked, I resorted 
to the aanual. Keyboard operation is coaplicated and cuabersoae. 
As I loaded in 90 active ailitary freqs I aade about 40 aistakes. 
With practice correcting the aistakes, I got a little better at 
it. Now able to scan through soae freqs I found it to be very 
sensitive. Signals on the PRO-2005 that were very weak or barely 
audible on AM were loud and clear on the AR-3000. Scanning with 
an earphone, I found an annoying cl ickety-clack every tiae a new 
channel was scanned through. I suraised that not enough internal 
shielding peraitted data transfers around the aicroprocessor to 
aake noise spikes in the RF section. Not good. In the SEARCH 
MODE, the saae thing happened. The SCAN/SEARCH rate is up to 20 
ch/sec. Large gaps in frequency, approxiaately 20 MHz caused the 
aicroprocessor to slow down and increase the acquisition tiae, 
whereas ay PRO-2905 zips along at 39 ch/sec and doesn't hesitate 

to acquire weak signals. (My PRO-2005 is supercharged with a 
PRO-2006 CPU at 18 MHz.) Even at 45 ch/sec, it doesn't fail to 
lock onto weak signals. Why is the AR-3000 so slow? 

The AR-3000 has 408 aesories which is sufficient for cost scanning 
needs. More cecory channels can be added by cocputer control and 
storage, but the radio's cecory is organized into four banks of 
180 each and they are not linkable. So you're licited to working 
with 100 channels at a tiae. If you're accustoced to or need aega 
cecory, there will be a serious problec. 

Audio in the AR-3000 was another drawback. The PRO-2005 has an 
upward facing speaker and it uses the cabinet as a speaker box so 
decent sound is heard. Nith both radios tuned to the saae 
broadcast FM station the PRO-2005 clearly had better audio than 
the bottoa firing AR-3000. 

Both radios suffer froc a too wide AM/NFM IF section. Adjacent 
channel interference is noticeable on both. A look inside the 
AR-3000 reveals three horizontally stacked boards in a shelf 
arrangecent. Very difficult to codify anything. The PRO-2005 can 
be easily codified as there is plenty of space for cod boards and 
all can be accessed with a cinicuc of difficulty. So if you 
wanted to change the 455 KHz IF filters for better selectivity, it 
can be done quite nicely on the PRO-2004/5/6. Virtually 
iapossible in the AR-3000. 

A nice feature in the AR-3000 is a prograccable attenuator for 
each channel. The PRO-2005 has a cost inconvenient rear counted 
slide switch that allows a flat 10 db of attenuation. 108 KHz to 
30 MHz, AM reception in the AR-3000 is cocprocised by the afore- 
mentioned IF filter. You can easily listen to two stations at the 
sace tiae. A prograccable or even a manual selectable wide/narrow 
IF switch would be very appropriate for this radio. In CN or 
sideband code, a narrow filter is used with very good results. 
While searching the HF bands you can't change codes froc AM to 
sideband, for example, without reentering the search paraceters 
and restarting froc the band edge. Very annoying... but again, the 
AR-3000 is still very sensitive on the HF bands, but lacks the 
selectivity on AM. The Radio Shack DX-440 blows the AR-3880 away 
in perforcance. So, the AR-3000 is an ok scanner, with problems, 
but is a mediocre shortwave receiver. The question is, "Is this 
radio worth $1,008?" I think not! Is it state of the art? In ay 
opinion, no. You eight be better off spending the extra $690 on a 
real shortwave receiver and buying a JIM M-180 or M-75 preamp for 
your PRO-2084/2805/2006 scanner. 

As a final note, the friendly and helpful people on the phone at 
Ace Cocaunications, which sells the AOR line of scanners, offer a 
25 day coney back guarantee. I took thee up on it and returned the 
AR-3000. Till we ceet again: "Professor Peabody". 

EDITOR'S NOTE: In all fairness to ACE Communications and to the 
AR-3009 scanner, I think one person’s perspective does not convey 
the w hole story . I how very little about the AR-3999, but w hat 1 
do how suggests that it was designed to operate nith assistance 
of a computer . I doubt that its capabilities and performance can 
be fully appreciated by strictly manual operation . So far, only 
one of our readers actually owns an AR-3999, but maybe he mill 
contribute another perspective for you . No w about it, Bill Fox? 


V1N2 - Page 4 


If you are a serious hacker and own either a PRO-2835 or a 
PRO-2806, you will need to crawl inside that intiaidating front 
panel sooner or later. Whether you want to speed up the scanner; 
add 6,000 channels of extra aetory, or install soae LEDs, jacks or 
switches in the front panel, you are siaply going to have to yank 
that circuit board froi its aounting place inside that front 
panel. At a glance, the process appears to be aost fearsoae to 
the casual observer. It really isn't so bad, however, and here's 
how you do it. Keep this section handy as the aonths go by, 
because I'd like to not repeat it again and there will be a nuaber 
of aodifications for the PR0-2805/6 which will require access to 
the front panel. In future projects, I will refer you back to the 
procedure below for the steps to get that Logic/CPU Board out of 
it's secure doaain to where you can aeddle with it. 

1. Disconnect the PRO-2005 froa AC or DC power. Reaove the top 
and bottoa cases froa the chassis. 

2. Disconnect all wires and cable bundles that go froa the front 
panel asseably to the wain circuit board. 

NOTE: there ere six (6) cable bundles I connectors to be 
disconnected froa the top side of the scanner, and one cable 
bundle 6 connector on the bottoa side of the scanner . 

NOTE: if you do not wish to lose what has been prograaaed 
into aeaory, this operation can still be safely done as 
further described, except be sun the Niaory detention Battery 
is good and left it its coaaartaeat on the rear of tie 
scanner. Furtheraore, do not disconnect the large 15-pin 
connector I cable bundle » Cl- 3 . Leaxe it connected to the 
Nain Board, but go ahead and disconnect all other cable 

Disconnect the two ground straps that go froa the Logic/CPU 
Board to the bottoa side of the scanner chassis. 

NOTE: All cable connectors and ground straps Mill disconnect 
froa the nain circuit board ; NOT froa the Logic/CPU Board . 

3. Reaove four (two on each side) countersunk aachine screws froa 
the sides of the front panel that secure it to the aain 
chassis. Gently, pull the front panel asseably away froa the 
scanner until it coaes free. 

4. Desolder froa the chroae aetal shield the saall bare ground 
wire that goes to the area by the VOLUME control. Desolder it 
at the chroae aetal shield and push this wire out of the way. 

5. Reaove the six saall screws that secure the Logic/CPU Board 
inside the front panel. 

6. Face the inside of the front panel placed in an upright 
position, and locate the white 13-pin connector (CN-581) at 
the upper left corner of the printed circuit board. This 
connector doesn't have any wires and doesn't look like a 
connector at first, but that's what it is. Place a saall flat 
blade screwdriver under that connector and gently pry upward. 
The entire Logic/CPU Board will slip up froa the plastic front 
panel and coae loose in your hands. Handle the board by its 
edges or by the chroae aetal shield only and lay the Logic/CPU 
Board aside near the scanner chassis. It will be just fine. 

7. Desolder the chroae aetal shield at six places around the 
printed circuit board and lift it up and off the board. 

NOTE: This is not coaplicated, and is fairly easy to do with 
a »ediui wattage soldering iron . Apply upward pressure with 
your fingers while the shield is heated at each leg . As the 
solder aelts, that leg of the shield Mill slip upvard and pop 

This coapletes the steps required to reaove the Logic/CPU Board 
froa its aounting location inside the front panel. You aay have 
to perfora this procedure aany tiaes throughout your ownership of 
the PRO-2805/6. You flight as well get coafortable with it. To 
reinstall the Logic/CPU Board into the front panel, siaply reverse 
the process given above. Here are a few concerns for the reversal 
that need to be highlighted as follows: 

A. After you've resoldered the six aetal legs of the chroae 
shield back to the printed circuit board, don't forget to 
resolder that bare ground wire froa the VOLUME CONTROL area 
back to the chroae aetal shield. While you're at it, Bake 
sure that this ground wire does not touch any of the pins of 
the VOLUME CONTROL. Bend it slightly, if necessary. 

B. Be careful when slipping the Logic/CPU Board back onto the 
pins of Connector CN-501. Make sure they line up before 
exerting any downward pressure. 

C. As the Logic/CPU Board is pressed back down onto CN-501, keep 
an eye on the front panel to ensure that the SOUND SQUELCH and 
DIMMER controls protrude through their respective holes 
without binding up. Also observe the SOUND SQUELCH LED to 
ensure that it is aligned with its hole in the front panel. 


Just as you wouldn't atteapt to change a flat tire on your car 
without a jack and a lug wrench, you better not aonkey around in 
your scanner (or other electronic equipaent) unless you have the 
Service Manual for your guide! I rarely bother to even look 
around inside a scanner unless I have the Service Manual handy. 
Another thing is even aore certain: I won't bother to assist or 
guide you with soae technical aspect of your equipaent unless YOU 
and I both have a copy of the Service Manual! Now that’s all 
there is to it; I aa adaaant; ornery, and persnickety when it 
coaes to not having the Service Manual. 

I eaphasized this need throughout both ay SCANNER MODIFICATION 
HANDBOOKS and will continue to do so here. A Service Manual is an 
essential tool for your technical excursions around the real 
estate of your equipaent. It is vital and necessary, so don't 
pooh pooh it away siaply because getting one involves a little 
tiae and ainor expense. You went to tiae and expense to get your 
scanner, now didn't you? The Service Manual is every bit as 
isportant as the scanner itself. Unless you will absolutely never 
take the case off. I aay relent in that instance. If you ever 

need ay assistance in a technical aatter involving your scanner 
and any of ay books or articles here, it will usually be freely 
given on the condition that you have the Service Manual and if I 
don't have one, that you send ae a clean, clear copy of yours. 
Also, I will not ordinarily render a professional opinion of the 
aodifiability of a given scanner unless we both have a copy of the 


I1N2 - Page 5 

Service Manual. Here is a list of the «anuals currently in ay TRICKS, HINTS, TIPS l KINKS DEPARTMENT 

files, so you need not bother sending one of these: 

















Please don't confuse the Service Manual with the Owner's Manual , 
which doesn't help ae help you whatsoever. He both need the 
Service Manual and here is where you can get thea: 




FT. NORTH TX 76106 

800-442-2425 & 817-870-5600 






317-842-0280 fc 800-428-5340 

THE RIGHT TOOLS FOR THE JOB : Radio Shack and other electronic 
suppliers offer a wide line of electronic tools and supplies to 
help you in your hacking and surgical efforts. They don't carry 
everything that you light need froi tiae to tiae, however. There 
is another excellent source for special purpose tools that I'd 
like to tell you about: DENTAL SUPPLY FIRMS! Say what? 

Hell, yes, dental tools can have superior application to the 
electronic hacker! How about that little lirror the dentist 
shoves into your aouth? Excellent for peeking around inside your 
scanner where you can't see very well! Then, perhaps best of all, 
are those poky things that hurt like hell that the dentist uses to 
scrape the plaque off your teeth! I don't know what they're 
called, but those tools are sure great for scraping solder flecks 
from circuit boards and they're excellent for cutting circuit 
traces on PC board! Dental plaque scrapers have a super sharp 
scraping edge and co*e in a variety of shapes, sizes and styles, 
with neat little crooks, bends and zig-zags so that you can reach 
just about any elusive corner in your scanner! 


317-842-1036 It 800-428-5340 






2112 - 116th NE 




317-842-1036 It 800-428-5340 


IRVINE TX 75063 



3071 - 15 ROAD 



Another neat dental tool is THEEZERS! Yeah, I know, you can buy 
tweezers just about anywhere, but they're all worthless. Dental 
tweezers have a superior feel to thea and a superior grip! Then 
there are surgical scalpels; you know, the sharp knives they use 
to cut your guas with. Also in a variety of styles and shapes, 
surgical scalpels coae with a peraanent handle and disposable 
blades. You can buy one or two handles and a variety of blades, 
soae curved one way, soae the other; soie straight and soae 
diagonal. These surgical scalpels are superior to *xacto u knives 
and such, such sharper! They'll not only split a hair, but also 
will split the split hair! You can use 'ei to slice warts and 
sioles if you can't find anything to cut in your scanner! If 
you're a serious hacker, it light behoove you to pay a visit to 
your local dental supply coipany and ask to see their hand tools! 

L0N6 BEACH CA 90801 

213-639-9000 / 213-639-7140 


10707 E. 106th STREET 

800-445-7717 It 317-842-7115 



DAYTON OH 45424 


DYNASCAN CORPORATION (COBRA) These are all the coipanies and 
6460 H. CORTLAND addresses that I have available 
CHICAGO IL 60635 for the scanner aanufacturers 
312-889-8870 It 800-262-7222 at the present tiie. If you 

have knowledge of other ifgrs 
or error corrections for the above, your input will be highly 
appreciated. I keep and aaintain an extensive data base of the 
entire Hobby Radio Industry in which the above is only a tiny 
part. I do not know where to get Service Manuals for scanners 
froi defunct coapanies such as J.I.L., Tennelec, Fairaate, etc. 
If you have inforaation of this nature, it would be appreciated. 
I will be printing considerable Source and Supply inforaation over 
the cosing issues, so your input is always valuable! 

PANEL LISHTIN6 FAILURE IN THE PRQ-2884/5/6/21/22: Much to ay 
chagrin, about a year ago, I observed the blue backlighting in the 
LCD Display of ay PRO-2004 to be getting diner and diner with 
the passage of tiae. I had no idea, initially, of the cause, and 
was soiewhat intiaidated about the prospects of looking into it. 
The eanner in which I had installed a nuaber of aodifications in 
ay PRO-2004 pretty auch sade it a total hassle to get to the 
inside of the LCD/Display Board where the backlight was located. 
Finally, a few aonths ago, the backlight went out altogether. 
That aotivated ae to find out why. 

Right off, I ordered a brand new plastic front panel for the 
PRO-2004 and then redesigned the physical installation scheae of 
all ay aodifications so that things could be accessed better. 
That necessitated tearing down the scanner to bare bones and 
practically rebuilding everything back up froi the ground floor. 
Turned out to be a rewarding project, but back to the subject. 
Once I was able to reiove the LCD/Display Board froi inside the 
front panel, one cause of the backlight failure was obvious: a 
quantity of aetal filings had collected over the years around the 
oscillator transforaer, T-731. Residual lagnetisa had polarized 
those particles which eventually shorted out the transforaer 
terainals and therefore caused the backlight to go out. 

THE mid SCMHER REPORT' (c) 199 1 

mi - Pige 6 


V1N2 - Page 7 

A good cleaning job got rid of the aetal particles, but to ay 
disaay, the backlight, though restored, was still very, very dia. 
Circuit tests and analysis didn't disclose any other problea, so I 
reasoned the fault to be a weak "Electroluainescent Panel 1 , a 
rectangular, flat slip of plastic that fits behind the glass LCD 
Display unit. This EL Panel appeared to contain soae sort of 
cheaicals sealed within the plastic and two wires protruded froa 
the end of the panel. A quick check of the Service Manual yielded 
the part nuaber and I ordered one froa Tandy's National Parts 
Center in Ft. North, Texas. Replaceaent of the new EL Panel 
resulted in a noraal brilliance of the backlighting again! 

Since then, I have encountered several other PRO-2004 '5 and now a 
PRO-2005 with very dia backlighting. Replaceaent of the EL panels 
restored the brilliance to noraal. I have also talked with 
another scanner technician, Bob Nhiston, of Colorado, who had 
independently deterained the saae problea and repair of these EL 
Panels. Ne think that the cheaical compound probably weakens with 
age and use and requires periodic replaceaent. There does seea to 
be a connection with age of the units. So, the bottoa line is 
that your PRO-2004, 2005, 2006, 2022, 2021 or any other with a 
backlight for the LCD Display will probably require a new EL Panel 
at soae tiae or another. Replaceaent is not difficult, but first 
you have to have the part which can be ordered froa Tandy National 
Parts Center in Ft. North, the address and phone nuaber of which 
are given elsewhere in this issue. Have a credit card handy and 
give the person to whoa you speak the following info for your rig: 



















Electro Luainescent 










Electro Luainescence 


These EL panels cost around $11 or so, a bit steep, but there are 
few alternatives. As your scanner ages, it aight be a good idea 
to order a couple for spares, just in case. Anyway, now that you 
have a replaceaent part, what to you do with it? Nell, you'll 
have to access the LCD Display unit, which usually aeans reaoving 

soaething froa inside the front panel. Nith the PRO-2004, -2022 
and 2021, the procedure is rather self-evident. In the PRO-2005 
and 2006, the instructions are given elsewhere in this issue. 

Once you can see the LCD Display unit, you'll see a creaa colored 
flat, rectangular plastic card that fits in a pair of grooves 
behind the LCD Display unit. There will be two wires, usually 
white and orange, that cose off this plastic card and solder to 
the nearby circuit board. Desolder those two wires and let thea 
hang free. This plastic EL Panel is sort of ceaented on the wire 
end to the LCD Display aodule. The ceaented seal has to be broken 
first, best done with a sharp blade and then the EL Panel will 
slide right out. The new one goes in the saae way; (new ceaent 
not necessary), resolder the two wires; reinstall the LCD Board 
back into the front panel. The backlighting will be fully 
restored and should last for another couple of years or so, 
depending on how often you use your scanner! 

The question arises as to why LEDs or soae other aore reliable 
backlighting scheae wasn't used? Current drain is the aost likely 
reason, I think. My tests indicate that these EL Panels and their 
driver circuits draw around 20-aA at the aost. A single LED, 
which offers practically no light, will draw that auch or aore! 
So the several LEDs that would be required for adequate lighting 
would draw a lot aore current than the EL Panel for the saae 
aaount of light. The saae reasoning underlies why incandescent 
panel laaps were not used; current drain, not to aention a 
distinct unreliability of incandescent bulbs. The EL Panel seeas 
like the best of several evils, but shaae on thea for being so 
age/failure prone! 

Do any of you Readers have a suggestion for a low current, bright 
backlighting scheae for the PRO-200X and PRO-202x scanners? 


Back in May, 1990, when the PRO-2006 arrived, I gave its scheaatic 
diagraa a cursory coaparison with the PRO-2005 '5 and deterained 
that the two were essentially the saae radio. The few differences 
I spotted right off were the CPU, IC-501, and the Clock Resonator, 







Check Iteis 




m mo» msum m optional m mi help as help you/ 

RADIO INTERESTS? (Put YEARS OF EXPERIENCE in each block that applies) 
VHF-UHF Aeateur CB Shortwave Professional 

Scanning? Radio? Radio? Listening? Radio? 

Career /Profession 

Or Occupation: 

List the sake & lodel of your scanners and other radio equipeent: 

List the lake i sodel of any coaputer equipment you own/operate: 

Single copy, per issue $4.00 
1991 (6 ios,Jan-June) $15.00 
1991 (1 yr) Jan-Dec $25.00 
1991-92 (2 yrs) $45.00 

$4 surf/$5 Air 
$17 surf/$22 Air 
$38 surf /$38 Air 
$55 surf /$78 Air 

List what you want in this newsletter; subjects, topics, etc 

Enclose a ili S.A.S.E. and one loose extra staap if you 
teed other intonation or a personal reply ! 

CX-581 . All other circuits appeared to be identical. 


V1H2 - Page 8 

Hell, they still are virtual twins, and the CPU It Clock reaain the 
essential difference but Bore has coae to light now. I have since 
found a tiny LMOS bilateral switch chip, IC-10, positioned between 
Pins 12 St 14 of IC-2. The Service Manual does not offer auch of 
any info on IC-10, though it is shown on the scheaatic diagraa and 
in the Parts List as a TC4S66F. IC-10 is in the general location 
where the well known Squelch Iaproveaent, MQD-4, is aade to the 
PRO-2004/5/6 as well as aany other radios! The presence of IC-10, 
a tiny surface aounted chip in the PRO-2006 eluded ae for a tiae 
until I perforaed the Squelch Iaproveaent for a client and the 
circuit board patterns just didn't aatch up with what I was 
faailiar. Sure enough, the PRO-2006 is a little different in this 
area coapared to the PRO-2004 It 2005. 

This new IC-10 is a bilateral switch that is triggered by the 
scanner's MUTE function, an internal signal that silences the 
speaker when SQUELCH is set and/or when the unit is SCANning or 
SEARCHing. I really haven't figured out why the designers put it 
in there as a new addition for the PRO-2006, but it doesn't seea 
to be of any consequence if eliainated for the Squelch Iaproveaent 
(MOD-4). The approach to MOD-4 for the PRO-2006 will be a little 
different, though, so refer below to the SCAMMER MODIFICATION 
HAMDBOQK CORNER for details of how to handle it. 


MOD-4: Iaprovinq Squelch Action! PRQ-2004/5/6 

PRO-2004: No Change - see last aonth, V1N1 

PRO-2005: No Change - see last aonth, V1M1 

PRO-2006: A bilateral LMOS switch has been found to exist between 
Pins 12 and 14 of IC-2. Therefore the procedure to 
iaprove the Squelch action will differ a little froa 
that for the PRO-2004 and -2005. There are several 
approaches, but I suggest the one as follows: 

(A) Using a saall, narrow tipped diagonal cutting pliers, snip Pin 
14 of IC-2. This will be done froa the top side of the aain 
receiver board. Snip Pin 14 halfway between the body of IC-2 
and the plane of the circuit board where it is soldered. 
Gently bend upward the cut pin at the body of IC-2 to separate 
the cut. 

(B) Solder a pair of flexible, fine hookup wires to the cut ends 
of Pin 14, IC-2. 

(0 Solder a 150-k to 200-k triaaer potentioaeter to the hookup 
wires installed in (B) above. Adjust the triaaer pot for 
desired squelch "tightness". HOTE: if the tri » pot has three 
leads f solder o»e hookup wire to its Middle lead and the other 
Hire to either end lead. 

You can hunt for this IC-10 in the PRO-2006 all day long and never 
find it! It's hidden away on the bottoa side of the aain circuit 
board just underneath and slightly forward of IC-2. IC-10 is 
hardly bigger than a resistor, and in fact, looks soaewhat like 
those tiny chip resistors around the vicinity. IC-10 has five 
pins, In, Out, Ground, ♦ Power, and a trigger to switch it on and 
off. It is nothing acre than a switch, though. In practice, 
IC-10 switches R-152 in and out between Pins 12 It 14 of IC-2. 
Hhen the receiver is auted, IC-10 is turned off to open the path 
between Pins 12 It 14 of IC-2. When the Squelch breaks and sounds 
coae out of the speaker, IC-10 switches on to connect R-152 
between Pins 12 It 14. In the PRO-2004, -2005 and other scanners, 
there is a peraanent, unswitched connection via a resistor between 
Pins 12 It 14, so the value of IC-10 reaains unclear. One thing is 
certain: IC-10 in the PRO-2006 is not an iaportant change. 


HOTE: The above approach is probably the best one if you caa find 
a way to nount the tr inner pot so that it doesn't interfere 
with anything. If you are good at nicrosurgery, you night be 
able to solder the tri n pot directly to the cut ends of Pin 
14, IC-2/ That Mould be a classy job and involve no Mires/ 

Another way you could do MOD-4 to your PRO-200 is to angle a 
dental plaque scraper in through the hole in the chassis below 
IC-2 and slit the circuit trace that goes to Pin 14 froa IC-10. 
Then froa above, solder a 200-k trie pot directly to Pins 14 and 
12 of IC-2. Just beware that this aethod effectively reaoves IC-10 
froa the circuit whereas the first aethod above retains IC-10 in 
circuit and active for soae as yet unknown purpose. In other 
words, I have done it both ways and really can't tell any 
differences yet. (The purpose of IC-10 is rather aysterious.) 


PO BOX 262478 
SAN DIEGO, CA 92196-2478